Police say they finally closed the trap in this case because they were afraid of losing track the suspects.

"The NYPD arrested Mr. Ferhani when he actually takes possession of the grenade and takes physical possession of the three handguns and the ammunition that accompanied them," prosecutor Margaret Gandy said. "It is on videotape. Therefore, the evidence again, Your Honor, is overwhelming."

The two men are being held without bail and are due back in court next week. If convicted, they could face life in prison without parole.